Yuusha ni Minna Netoraretakedo Akiramezu ni Tatakao. Kitto Saigo wa Ore ga Katsu
The original web novel (WN) by is known for having multiple "routes" that lead to very different outcomes:
Roughly translated, this means: "Everyone was stolen from me by the Hero, but I won’t give up—I’ll keep fighting. Surely, in the end, I will win. Raw better."